Author's Note:

If you guys have ever looked into other Undertale fan creations… you can probably guess what's going to happen in this chapter from the title. Sorry this one is later than usual!

Chapter 6

Disbelief

Papyrus was alone in the barrier room, while Undyne and Asgore were talking about how they would deal with Sans. Papyrus fought back the tears, but he truly was heartbroken. His dear brother had abandoned him, to live the life of a killer. No, not a killer, a genocidal maniac. Just what was Sans trying to accomplish? Papyrus lost himself in thought, when suddenly he heard a familiar voice call out to him.

"Howdy, Papyrus! What's gotten you all down in the dumps?" Papyrus looked behind him to see Flowey. Flowey would give Papyrus advice on what to do in life, but he would show up randomly. Maybe this would be Papyrus's chance to make a plan.

"OH… FLOWEY. IT'S JUST… SOMETHING WITH MY BROTHER. HIS MIND IS IN A HORRIBLE PLACE RIGHT NOW."

"Did he hurt you, Papyrus?"

"WHAT? NO… HE HASN'T ATTACKED ME. HE'S JUST… HE'S ATTACKED EVERYONE ELSE BESIDES ME. Flowey's eyes widened. He hadn't been checking in to see what was happening, this was all news to him.

"Papyrus… listen to me. Sans is your brother, and you have to be there for him. But… maybe words alone won't get to him. I know you don't want to do this… but you have to fight him." Papyrus looked down. He expected that he would have to do as much, he just didn't want to. "Papyrus, just remember one thing for me, my dear friend. Sometimes… in this world…" Papyrus looked into Flowey's eyes, as Flowey's face distorted slightly. Papyrus flinched, but stayed strong. "It's kill or be killed." And with that, Flowey burrowed into the ground, leaving Papyrus to his thoughts. Kill or be killed… would Papyrus really be able to kill his dear brother? He got up and left the room, and walked towards the throne room. He looked at Undyne, and realized something. Papyrus didn't want to lose any more friends. He saw Undyne when she lost Alphys, and realized how heart breaking it would be if he had lost Undyne. Maybe Flowey was right, maybe he would have to fight Sans.

Maybe this world really is kill or be killed.

"Asgore, we NEED a plan. We can't talk our way out of this! HE IS KILLING EVERYONE! We watched that Sans fight Mettaton thanks to the cameras on Alphys's phone, we know what he's capable of!" Undyne was yelling, trying to get it through to Asgore that Sans needed to be stopped. "If you're not going to kill him, then-"

"THEN I WILL." Undyne froze in place, as she turned around to see Papyrus. The sadness in Papyrus's eyes had disappeared and had been replaced by raw determination.

"Papyrus… let me-"

"NO. HE IS MY BROTHER. HE IS MY RESPONSIBILITY. GIVE ME A HUMAN SOUL. I'LL HANDLE HIM."

"Pap-"

"I SAID GIVE ME A SOUL!" Undyne staggered. Never before had she heard Papyrus yell. He was naturally a loud talker, but never before had he yelled at her. For once in his life, Papyrus was truly determined to do something, and he might have been able to do it. If anyone could stop Sans, it would be him.

"…Okay, Papyrus. Come with me." Undyne went towards the barrier room, Papyrus following her. Once they reached the souls, Undyne took two and gave them both to Papyrus. "Sans has two human souls now. With just one, you won't stand a chance. Take both, and you might stand a chance." Without hesitation, Papyrus absorbed the two human souls. The souls were orange and dark blue in color. As Papyrus absorbed them, his eyes began to glow a bright orange, and he now had an orange aura around him. "Papyrus? How… do you feel?"

"It doesn't matter how I feel. I have to do this. For everyone that's died." Papyrus's tone of voice was suddenly infinitely more serious than ever before. For once in his life, he was going to fight for someone other than himself. He was going to fight for a reason that wasn't just to impress someone so he could become popular.

He was going to fight for what was right.

Sans went down the long hall of New Home. Undyne didn't have many places left to hide. He was going to kill everyone. Every single monster that was still alive was going to be killed by his hands. And once he was donem, he planned to open the barrier, and have his revenge on the human who slaughtered everyone he once loved in previous timelines, and who trapped him and the rest of the monsters underground in the first place. He reached the end, and walked into Judgement Hall. Sans was more than familiar with this place. Sans had fought Frisk here countless times, and killed Frisk here countless times. He walked down the corridor, and suddenly, a tall black figure, with glowing orange eyes came into picture.

"Sans." The voice was familiar to Sans, but so serious.

"…Papyrus?" Sans was shocked that his brother's voice had changed so much.

"You know, I almost expected you not to show up. You've had me waiting here for a while now. I was tempted to go look for you myself. But now, here you are, in front of me. The brother that I used to know." Papyrus's words were cold, stripped from all emotion he once had.

"…Why are you here, Papyrus? I'm here for Undyne, and the humans. You don't have to get hurt. We're brothers, remember? I've done my best not to atta-"

"BULLSHIT. I've done so much to try and help you, and you've just gone and pushed me to the side like you've done the rest of your life. You think I consider you a brother?! You're NOTHING to me anymore, Sans. You aren't worth the dirt that you've tainted with the dust of all the fallen monsters." Papyrus's words now cut like a knife into Sans. Every word he spoke hurt him more than the last. Sans didn't want to hurt Papyrus, he wanted to hurt everyone else. He wanted to protect Papyrus.

"Papyrus. Enough. I'm going to go to Asgore's throne, find Undyne, kill her, take the five remaining human souls, and destroy the barrier. Then, I'm going to take revenge on the humans for EVERYTHING they've done to me. So just get out of my way, this last time, and after that we'll have nothing to worry about! We can live happily ever after."

"Five human souls? Oh brother… are you so simple minded?" Papyrus pointed to his own eyes. "THESE eyes aren't natural. These eyes of ours only activate when we feel more powerful than before. There are only three souls back there now, Sans. I have the other two; and if you want to break that barrier so bad, then you'll have to break EVERY bone in my body and take the souls from me yourself!" With that said, Papyrus summoned bones to his side and launched them at Sans. Sans dodged them all, before looking Papyrus in the eyes and launching the same attack back at him. Once the bones started to fly towards him, Papyrus put his hands up, and an orange barrier spawned and deflected all of the bones. Sans looked surprised at this attack, as he's never seen Papyrus use an attack that didn't have to do with bones. "Surprised? Oh, foolish Sans, did you think these souls came with no extra powers? I can do everything I could before much better, and I have even more new tricks. Give up!" Papyrus summoned a large bone to his hands, as big as his entire body, and charged at Sans. Sans backed up and summoned a Gaster Blaster to try and scare Papyrus off, however, Papyrus jumped over the blaster and swung his bone at Sans. Sans teleported out of the way and landed on the blaster. He summoned two bones to hit hands and tried to swing at Papyrus. Papyrus turned around and blocked his bones with his own bone. They both gritted their teeth and looked at each other angrily. Papyrus pushed Sans off of him and smashed the blaster that was previously under his feet. The blaster cracked open and then disappeared. Sans was even more surprised than ever, he had never seen a Gaster Blaster damaged before. He threw the bones in his hands at his brother and summoned another blaster. As Papyrus smashed the bones with his own, Sans fired the blaster, aiming right at Papyrus. Papyrus jumped up and to Sans's surprise, summoned his own Gaster Blaster and landed on it. Sans pointed his blaster at Papyrus's, and they both fired them at each other. After Papyrus fired his blaster, he jumped off and attempted to land on top of Sans. Seeing this, Sans teleported to the left, as Papyrus landed on his feet where Sans originally was. Papyrus instantly looked in Sans's direction, with pure hatred in his eyes. The blue aura surrounding Sans suddenly grew larger, as he charged at Papyrus with two bones in his hand. Papyrus, with the same large bone that was previously in his hands, blocked Sans's attack and threw him in the air. While Sans was in the air, Papyrus used his blue magic and smashed Sans into the wall. Sans grunted in pain as he hit the wall and started to slide down. Once Sans had reached the floor, his vision became blurry. He looked up and saw nothing but a dark figure with bright orange eyes, with a dark weapon in his hands. The dark figure lifted his weapon and began to swing at Sans, when suddenly, Sans found the urge to point his hands towards the figure. Once he did, his vision became clear as he spawned a blue barrier and blocked the attack. Papyrus was shocked that Sans had adapted and learned one of Papyrus's new attacks already. Once Sans put the barrier away, he rose to his feet and put his hands to Papyrus's chest. As he put them to his chest, he concentrated his magic, and pushed Papyrus to the other side of the hall. Papyrus however, was able to land on his feet. Papyrus held the bone in one of his hands behind him, as he concentrated his magic. He summoned what seemed to be orange fire in his other hand and fired it at Sans. Sans summoned a Gaster Blaster in front of him and shot it's beam at the fireball, however the fireball seemed to only get bigger as it collided with the blast. Sans saw this and teleported away from where he was, and came face to face with Papyrus. Papyrus was surprised that he had the courage to appear right in front of him, and Sans used this to his advantage as he summoned a large bone to his hands and swung at Papyrus, hitting him directly in the chest. Papyrus staggered from the blow, and Sans proceeded to break his bone in half, then using the two parts of the bone to attack his brother repeatedly. After a few strikes, Sans finally knocked Papyrus down. Once he knocked him down, Sans summoned a large bone and aimed for Papyrus's head. However, Papyrus caught the bone in his hands. They both struggled, trying to push the bone at each other. After struggling for a while, Sans's mind drifted off. He thought about why he was fighting, and he thought about the hatred that occupied his soul. Sans realized that losing this fight was NOT an option. Sans's eyes began to glow brighter, as his hands suddenly ignite in blue flames. Sans burned the bone in his hands as Papyrus quickly got to his feet, summoning another bone and swinging at Sans. Sans took the moment that Papyrus took to swing his weapon to punch his brother in the chest. The attack caught Papyrus off guard, and Sans took the moment of surprise to continue punching his brother, alternating between hitting him in the chest and the face.

"I… won't…" The flames in San's hands suddenly burned hotter, as the anger in his eyes flared. "LOSE!" Sans suddenly summoned a fireball and hit Papyrus in the chest with it. The impact of the attack pushed Papyrus to the ground. As he hit the ground, Sans shot another fireball at Papyrus's chest. With that last hit, Papyrus's body began to disintegrate, leaving behind only his head. The sight of his brother, dead by his own hands, made Sans begin to tear up a bit. "Brother… why?! Why did you make me fight you?! Kill you, even?! I… I didn't want you to die! I wanted to make life better for both of us! I wanted to take revenge on everyone that hurt us, so the two of us could live a happier life! Why… why did you make me do this?!" Tears flooded down Sans's face as he spoke.

"Brother… I didn't want this to happen either. Neither of us did. Neither of us wanted this… but it happened. If you wanted things to change, you should have told me. I would have helped you. In every way I possibly could. I didn't fight you because I didn't want the best for you. I fought you because this was the wrong road to take. I wasn't going to kill you. I just wanted you to understand… that this path you're taking… isn't the right one." Papyrus coughed, having suffered more wounds than he thought. "And… if my death will help you see the light… then I'm okay with that." Papyrus closed his eyes. The pain was starting to become unbearable for him. Sans closed his eyes. He tried convincing himself that this wasn't real. He tried convincing himself that he had too much to drink, and that he passed out and was having a bad dream. As his eyes were closed, he heard a gasp of pain. Once he opened his eyes, he was horrified to see a blue spear through Papyrus's skull. He looked up, and saw Undyne standing there, laughing like a maniac. Her body had changed, she must have absorbed human souls too.

"How does it feel, you fuck?! To lose someone close to you? Do you feel it? The pain that you gave me when you KILLED ALPHYS?!" Undyne's words echoed across the room.

"You… what… WHAT THE FUCK DID YOU DO?!" Sans looked at his brother's skull, as it slowly disintegrated into nothingness. The human souls came out after his skull was gone.

"Oh, get over it! After all, you're going to see him again VERY soon… after I kill you!" Undyne charged at Sans, with a spear in hand. She aimed her spear right at Sans's skull, the attack alone should be enough to kill him. There was a bright light, and Undyne lost her vision for a second. Once she regained her vision, she saw Sans holding on to her spear from the other side. "What?! How… how are you able to resist my strength?! I have THREE human souls absorbed! This should be impossible for you to resist! How are you…" She then noticed that the two souls Papyrus had were now missing. Sans looked Undyne right in the eyes. His left eye was completely blue, while his right eye was completely orange.

" r."